<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./css/inputnumber.css" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>购物车</title>
  </head>
  <body>
    <div class="app-container" id="app">
      <!-- 顶部banner -->
      <div class="banner-box">
        <img src="http://autumnfish.cn/static/fruit.jpg" alt="" />
      </div>
      <!-- 面包屑 -->
      <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
      </div>
      <!-- 购物车主体 -->
      <div class="main">
        <div class="table">
          <!-- 头部 -->
          <div class="thead">
            <div class="tr">
              <div class="th">选中</div>
              <div class="th th-pic">图片</div>
              <div class="th">单价</div>
              <div class="th num-th">个数</div>
              <div class="th">小计</div>
              <div class="th">操作</div>
            </div>
          </div>
          <!-- 身体 -->
          <div class="tbody">
            <div
              class="tr"
              :class="{active:item.isChecked}"
              v-for="(item,index) in fruitList"
              :key="item.id"
            >
              <div class="td">
                <input type="checkbox" v-model="item.isChecked" />
              </div>
              <div class="td">
                <img :src="item.icon" alt="" />
              </div>
              <div class="td">{{item.price}}</div>
              <div class="td">
                <div class="my-input-number">
                  <button
                    class="decrease"
                    @click="item.num>1 ? item.num-- : item.num=1"
                  >
                    -
                  </button>
                  <span class="my-input__inner">{{item.num}}</span>
                  <button class="increase" @click="item.num++">+</button>
                </div>
              </div>
              <div class="td">{{item.num*item.price}}</div>
              <div class="td" @click="del(index)"><button>删除</button></div>
            </div>

            <!-- <div class="tr">
              <div class="td"><input type="checkbox" /></div>
              <div class="td">
                <img src="http://autumnfish.cn/static/荔枝.png" alt="" />
              </div>
              <div class="td">7</div>
              <div class="td">
                <div class="my-input-number">
                  <button disabled class="decrease">-</button>
                  <span class="my-input__inner">1</span>
                  <button class="increase">+</button>
                </div>
              </div>
              <div class="td">14</div>
              <div class="td"><button>删除</button></div>
            </div> -->
          </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
          <!-- 全选 -->
          <label class="check-all">
            <input type="checkbox" v-model="isAllChcked" />
            全选
          </label>
          <div class="right-box">
            <!-- 所有商品总价 -->
            <span class="price-box"
              >总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price"
                >{{totalPrice()}}</span
              ></span
            >
            <!-- 结算按钮 -->
            <button class="pay">结算( {{totalNum()}} )</button>
          </div>
        </div>
      </div>
      <!-- 空车 -->
      <div class="empty">🛒空空如也</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      // 1.渲染列表
      // 2.全选
      // 3.计算数量
      // 4.计算合计
      // 5.删除
      const app = new Vue({
        el: "#app",
        data: {
          // isAllChcked: false, // 是否全选
          // 水果列表
          fruitList: localStorage.getItem("fruitList")
            ? JSON.parse(localStorage.getItem("fruitList"))
            : [
                {
                  id: 1,
                  icon: "./img/火龙果.png",
                  isChecked: true,
                  num: 2,
                  price: 6,
                },
                {
                  id: 2,
                  icon: "./img/荔枝.png",
                  isChecked: false,
                  num: 7,
                  price: 20,
                },
                {
                  id: 3,
                  icon: "./img/榴莲.png",
                  isChecked: false,
                  num: 3,
                  price: 40,
                },
                {
                  id: 4,
                  icon: "./img/鸭梨.png",
                  isChecked: true,
                  num: 10,
                  price: 3,
                },
                {
                  id: 5,
                  icon: "./img/樱桃.png",
                  isChecked: false,
                  num: 20,
                  price: 34,
                },
              ],
        },
        computed: {
          //是否全选
          isAllChcked: {
            set(val) {
              // 如果全选框被选中则列表中所有的元素都要被选中
              this.fruitList.forEach((item) => {
                item.isChecked = val;
              });
            },
            get() {
              // 如果列表中所有的元素都被选中，则全选框被勾选
              return this.fruitList.every((el) => el.isChecked);
            },
          },
        },
        methods: {
          //计算总价
          totalPrice() {
            return this.fruitList
              .filter((el) => {
                return el.isChecked;
              })
              .reduce((pre, cur) => {
                if (cur.isChecked) return (pre += cur.num * cur.price);
              }, 0);
          },
          // 计算总数
          totalNum() {
            return this.fruitList
              .filter((el) => {
                return el.isChecked;
              })
              .reduce((pre, cur) => {
                return (pre += cur.num);
              }, 0);
          },
          //删除
          del(index) {
            this.fruitList.splice(index, 1);
          },
        },
        watch: {
          fruitList: {
            handler(val) {
              console.log(val);
              localStorage.setItem("fruitList", JSON.stringify(val));
            },
            deep: true,
          },
        },
      });
    </script>
  </body>
</html>
